Symptom Troubleshooting

HandsFreeLink System Symptom Troubleshooting - The HFL messages and voice prompts cannot be heard or are weak

The HFL messages and voice prompts cannot be heard or are weak

NOTE: Before doing this troubleshooting, refer to General Troubleshooting Information Initial Inspection and Diagnostic Overview to make sure the phone is compatible and configured correctly.

1. Turn the ignition switch to ON (II).

2. Check that the audio system is operating normally and the speaker sound levels from different audio sources (AM/FM, XM, CD, Navigation, etc.) are normal.

Does the audio system work normally and is the audio output from the speaker normal when playing various audio sources?

YES -

Go to step 3.

NO -

Refer to the audio system symptom troubleshooting.�

3. Press the HFL talk button.

Does the audio system mute when HFL messages are being played?

YES -

Go to step 4.

NO -

Go to step 9.

4. Turn the ignition switch to LOCK (0).

5. Disconnect audio unit connector D (20P) and the HandsFreeLink control unit 28P connector.

6. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 11 and No. 25 and audio unit connector D (20P) terminals No. 9 and
No. 19 respectively.





Is there continuity?

YES -

Go to step 7.

NO -

There is an open in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

7. Check for continuity between body ground and audio unit connector D (20P) terminals No. 9 and No. 19 individually.





Is there continuity?

YES -

There is a short to body ground in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

NO -

Go to step 8.

8. Check for continuity between the terminals of audio unit connector D (20P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wires between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

NO -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom does not go away, replace the audio unit Audio Unit Removal/Installation.�

9. Press the HFL talk button.

Does the MID or the audio-HVAC display show the HFL menu and does the MID or audio-HVAC display show HandsFreeLink when pressing the HFL talk button?

YES -

Go to step 10.

NO -

Go to step 14.

10. Turn the ignition switch to LOCK (0).

11. Disconnect the HandsFreeLink control unit 28P connector, the front HFL-navigation-ANC microphone 7P connector, and audio unit connector D (20P).

12. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 3 and audio unit connector D (20P) terminal No. 20.





Is there continuity?

YES -

Go to step 13.

NO -

Repair an open in the wire between the HandsFreeLink control unit and the audio unit.�

13. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the HandsFreeLink control unit and the audio unit.�

NO -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom does not go away, substitute a know-good front HFL-navigation-ANC microphone Service and Repair, and retest. If the symptom goes away, replace the original front HFL-navigation-ANC microphone Service and Repair. If the symptom does not go away, replace the audio unit Audio Unit Removal/Installation.�

14. Turn the ignition switch to LOCK (0).

15. Disconnect the HandsFreeLink control unit 28P connector and HFL-voice control switch 5P connector.

16. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and HFL-voice control switch 5P connector terminal No. 3.





Is there continuity?

YES -

Do the HFL Switch Test HFL Switch Test.�

NO -

Repair an open in the wire between the HandsFreeLink control unit and the HFL-voice control switch.�